plumiLattice enthalpy and Born–Haber cycles: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 5.2.1.1 Lattice enthalpy and Born–Haber cycles, 2016–2025, with mark schemes and examiner’s reports where available.
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All 11 questions on Lattice enthalpy and Born–Haber cycles, as a list
- June 2025, Paper 1, Q3 (1 mark): The diagram shows the Born-Haber cycle for sodium oxide, Na2O. 2Na+(g) + O2–(g) 2Na+(g) + O(g) + 2e– 2Na+(g) + O–(g) + e– 2Na(g) + O(g) 2Na(g) + ½O2(g) 2Na(s) +
- June 2024, Paper 1, Q16(c)(i) (2 marks): Define the term lattice enthalpy. [2]
- June 2024, Paper 1, Q16(c)(ii) (3 marks): The diagram shows an incomplete Born-Haber cycle that can be used to determine the lattice enthalpy of MnO. Mn2+(g) + O(g) + 2e– Mn2+(g) + O2–(g) 1 Mn2+(g) + O2
- June 2024, Paper 1, Q16(c)(iii) (2 marks): Calculate the lattice enthalpy of MnO. lattice enthalpy = kJ mol–1 [2]
- June 2023, Paper 1, Q16(a)(i) (4 marks): The diagram below shows an incomplete Born-Haber cycle that can be used to calculate the lattice enthalpy of barium iodide. On the dotted lines, add the species
- June 2023, Paper 1, Q16(a)(ii) (2 marks): Calculate the lattice enthalpy of barium iodide. lattice enthalpy = kJ mol–1 [2]
- June 2022, Paper 1, Q9 (1 mark): Which equation represents the change that accompanies the standard enthalpy change of atomisation of bromine? A ½ Br2(l) Br(g) B Br2(l) 2Br(g) C ½ Br2(g) Br(g)
- November 2020, Paper 1, Q16(d)(iii) (3 marks): Write the equation for the lattice enthalpy of magnesium bromide and calculate the lattice enthalpy of magnesium bromide. Equation Calculation lattice enthalpy
- June 2019, Paper 1, Q16(d)(i) (4 marks): The incomplete Born–Haber cycle below can be used to determine the lattice enthalpy of potassium oxide. In the boxes, complete the species present in the cycle.
- June 2019, Paper 1, Q16(d)(ii) (2 marks): Calculate the lattice enthalpy of potassium oxide. lattice enthalpy = kJ mol−1 [2]
- June 2018, Paper 1, Q13 (1 mark): Which enthalpy change(s) is/are endothermic? 1 The bond enthalpy of the C–H bond 2 The second electron affinity of oxygen 3 The standard enthalpy change of form
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